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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <!-- div标签 -->
    <div>你好HTML</div>
    <div>第二个HTML</div>

    <!-- p标签 -->
    <p>你好P</p>
    <p>第二个P</p>

    <!-- span标签 -->
    <span>你好SPAN</span>
    <span>第二个SPAN</span>

    <!-- ul+li标签 -->
     <ul>
        <li>第一个LI</li>
        <li>第二个LI</li>
        <li>第三个LI</li>
     </ul>

     <!-- h1-h6标签 -->
      <h1>一级标题</h1>
      <h2>二级标题</h2>
      <h3>三级标题</h3>
      <h4>四级标题</h4>
      <h5>五级标题</h5>
      <h6>六级标题</h6>

      <div>
        <p>
            <span>123</span>
        </p>
      </div>

      <h1>
        <h2>几级标题？</h2>
      </h1>
</body>

</html>